For the great depths that may be encountered in the
ocean the compressibility of seawater may become an important
consideration. (a) Assume that the bulk modulus for seawater
is constant and derive a relationship between pressure and
depth which takes into account the change in fluid density with
depth. (b) Make use of part 1a2 to determine the pressure at a
depth of 6 km assuming seawater has a bulk modulus of
and a density of at the surface. Compare
this result with that obtained by assuming a constant density